Question 65
MediumOriginal questionThree runners take 30, 40 and 60 seconds to complete a lap. They start together from the starting point. After how many seconds are all three next at the start together?
Show the answer and explanation
CorrectNot quiteAnswer B
Correct answer: B
Explanation
They are all at the start at a common multiple of 30, 40 and 60.
seconds.
Worth noting
240 is a common multiple, but 120 comes first.
- Concept
- Meeting at the starting point
- Typical timeTypical
- 90 s
- Your timeYours
- —
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